d-21=-8

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Solution for d-21=-8 equation: 


Simplifying
d + -21 = -8

Reorder the terms:
-21 + d = -8

Solving
-21 + d = -8

Solving for variable 'd'.

Move all terms containing d to the left, all other terms to the right.

Add '21' to each side of the equation.
-21 + 21 + d = -8 + 21

Combine like terms: -21 + 21 = 0
0 + d = -8 + 21
d = -8 + 21

Combine like terms: -8 + 21 = 13
d = 13

Simplifying
d = 13

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